Yes you can mine for another 6 months as dag is currently around 2.42 GB. If you have GTX 1060 3gb I recommend Zcash.
Actually for all Nvidia I recommend Zcash mining instead of EThash
If you trade immediately it depends on the memory in the 1060.
I have 9 that deliver close to identical 295 sol/s and 24 Mh/s with the same oc settings (140 1400) and max 80w. It's possible to push 310 sol/s but it then takes more power.
There is currently more $ to be made (and more $per W) when using ethash, and there will be several reasons to switch back and fort before the DAG file does not fit.
If your 1060 only can get around 19.5Mh/s, then it's a different calculation.